摘要
北部湾盆地涠西南凹陷中深湖相区沉积的流二段生油岩,在涠洲组沉积时就达到了生油门限深度,有机质成熟并产生烃类,孔隙流体热膨胀和结晶水的排出,导致孔隙流体体积增加,从而引起生油岩层内孔隙流体高压异常。生油岩异常压力最大值是油气向上向下运移的分界面和油气初次运移的动力。
Source rock of the second member of Liushagang Formation, which deposited in middle-deep lacustrine facies of South-Western Weizhou sag in Beibu Gulf basin,reached threshold of oil wi- ndow during deposition of Weizhou formation.The organic ma- tters were mature and produced hydrocarbons.The volume of pore fluids was increased by thermal expansion of pore fluids and expulsion of crystalline water into the pores,resulting in abnormal pressure of pore fluids in the source rock. The surface where the maximum geopressure occurs would surve as the boundary for upward or downward migration of hydrocarbons.Besides,differential geopressure is expected to initiate primary migration of hydrocarbons.
出处
《中国海上油气（地质）》
1989年第4期37-41,共5页
China Offshore Oil and Gas(Geology)
